Gary Gygax has died. We owe to him a common hobby, and everything that has stemmed from it. I challenge you to find someone whose influence has been as pervasive in the gaming world. Before you answer, consider that even modern games like World of Warcraft and Final Fantasy haven't made much progress beyond their common ancestor, D&D.
PS. This Tribute is much better than anything I could say.
Now playing: Danny Elfman - Town Meeting Song